#!/usr/bin/env python
from __future__ import print_function
import os, itertools, urllib, urllib2, sys

def get_ch_answer(query):
    return urllib.urlopen(os.environ.get('CLICKHOUSE_URL', 'http://localhost:' + os.environ.get('CLICKHOUSE_PORT_HTTP', '8123') ), data=query).read()

def check_answers(query, answer):
    ch_answer = get_ch_answer(query)
    if ch_answer.strip() != answer.strip():
        print("FAIL on query:", query)
        print("Expected answer:", answer)
        print("Fetched answer :", ch_answer)
        exit(-1)

def get_values():
    values = [0, 1, -1]
    for bits in [8, 16, 32, 64]:
        values += [2**bits, 2**bits - 1]
        values += [2**(bits-1) - 1, 2**(bits-1), 2**(bits-1) + 1]
        values += [-2**(bits-1) - 1, -2**(bits-1), -2**(bits-1) + 1]
    return values

def is_valid_integer(x):
    return -2**63 <= x and x <= 2**64-1


TEST_WITH_CASTING=True
GENERATE_TEST_FILES=False

TYPES = {
    "UInt8"    : { "bits" : 8, "sign" : False, "float" : False },
    "Int8"     : { "bits" : 8, "sign" : True, "float" : False },

    "UInt16": { "bits" : 16, "sign" : False, "float" : False },
    "Int16" : { "bits" : 16, "sign" : True, "float" : False },

    "UInt32": { "bits" : 32, "sign" : False, "float" : False },
    "Int32" : { "bits" : 32, "sign" : True, "float" : False },

    "UInt64": { "bits" : 64, "sign" : False, "float" : False },
    "Int64" : { "bits" : 64, "sign" : True, "float" : False }

    #"Float32" : { "bits" : 32, "sign" : True, "float" : True },
    #"Float64" : { "bits" : 64, "sign" : True, "float" : True }
}


def inside_range(value, type_name):
    bits = TYPES[type_name]["bits"]
    signed = TYPES[type_name]["sign"]
    is_float = TYPES[type_name]["float"]

    if is_float:
        return True

    if signed:
        return -2**(bits-1) <= value and value <= 2**(bits-1) - 1
    else:
        return 0 <= value and value <= 2**bits - 1


def test_operators(v1, v2, v1_passed, v2_passed):
    query_str = "{v1} = {v2}, {v1} != {v2}, {v1} < {v2}, {v1} <= {v2}, {v1} > {v2}, {v1} >= {v2},\t".format(v1=v1_passed, v2=v2_passed)
    query_str += "{v1} = {v2}, {v1} != {v2}, {v1} < {v2}, {v1} <= {v2}, {v1} > {v2}, {v1} >= {v2} ".format(v1=v2_passed, v2=v1_passed)

    answers = [v1 == v2, v1 != v2, v1 < v2, v1 <= v2, v1 > v2, v1 >= v2]
    answers += [v2 == v1, v2 != v1, v2 < v1, v2 <= v1, v2 > v1, v2 >= v1]

    answers_str = "\t".join([str(int(x)) for x in answers])

    return (query_str, answers_str)


VALUES = [x for x in get_values() if is_valid_integer(x)]

def test_pair(v1, v2):
    query = "SELECT {}, {}, ".format(v1, v2)
    answers = "{}\t{}\t".format(v1, v2)

    q, a = test_operators(v1, v2, str(v1), str(v2))
    query += q
    answers += a

    if TEST_WITH_CASTING:
        for t1 in TYPES.iterkeys():
            if inside_range(v1, t1):
                for t2 in TYPES.iterkeys():
                    if inside_range(v2, t2):
                        q, a = test_operators(v1, v2, 'to{}({})'.format(t1, v1), 'to{}({})'.format(t2, v2))
                        query += ', ' + q
                        answers += "\t" + a

    check_answers(query, answers)
    return query, answers


VALUES_INT = [0, -1, 1, 2**64-1, 2**63, -2**63, 2**63-1, 2**51, 2**52, 2**53-1, 2**53, 2**53+1, 2**53+2, -2**53+1, -2**53, -2**53-1, -2**53-2, 2*52, -2**52]
VALUES_FLOAT = [float(x) for x in VALUES_INT + [-0.5, 0.5, -1.5, 1.5, 2**53, 2**51 - 0.5, 2**51 + 0.5, 2**60, -2**60, -2**63 - 10000, 2**63 + 10000]]

def test_float_pair(i, f):
    f_str = ("%.9f" % f)
    query = "SELECT '{}', '{}', ".format(i, f_str)
    answers = "{}\t{}\t".format(i, f_str)

    q, a = test_operators(i, f, i, f_str)
    query += q
    answers += a

    if TEST_WITH_CASTING:
        for t1 in TYPES.iterkeys():
            if inside_range(i, t1):
                q, a = test_operators(i, f, 'to{}({})'.format(t1, i), f_str)
                query += ', ' + q
                answers += "\t" + a

    check_answers(query, answers)
    return query, answers


def main():
    if GENERATE_TEST_FILES:
        base_name = '00411_accurate_number_comparison'
        sql_file = open(base_name + '.sql', 'wt')
        ref_file = open(base_name + '.reference', 'wt')

    num_int_tests = len(list(itertools.combinations(VALUES, 2)))

    num_parts = 4
    for part in xrange(0, num_parts):
        if 'int' + str(part + 1) in sys.argv[1:]:
            for (v1, v2) in itertools.islice(itertools.combinations(VALUES, 2), part * num_int_tests / num_parts, (part + 1) * num_int_tests / num_parts):
                q, a = test_pair(v1, v2)
                if GENERATE_TEST_FILES:
                    sql_file.write(q + ";\n")
                    ref_file.write(a + "\n")

    if 'float' in sys.argv[1:]:
        for (i, f) in itertools.product(VALUES_INT, VALUES_FLOAT):
            q, a = test_float_pair(i, f)
            if GENERATE_TEST_FILES:
                sql_file.write(q + ";\n")
                ref_file.write(a + "\n")

    print("PASSED")


if __name__ == "__main__":
    main()
